Electric lamp.



- Patented Dec. 31, 1912.

INVENTOR WITNESSES FRANK L. FOWLER, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC LAMP.

Specification of Letters Patent.

Patented Dec. 31, 1912.

Application filed March 28, 1912. Serial No. 686,771.

7 0 (171 whom 2'25 may concern Be it known that T, FRANK L. FOWLER, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Electric Lamp, of which the following is a specification.

This invention relates to electric lamps and has for an object to provide a construction whereby the lamp filament may be replaced and the lamp bulb and filament support used again thereby effecting a material saving in the renewal of lamps in which the filament has become broken or burned out.

It has for a further object to provide a novel form of lamp base by means of which the lamp may be readily attached to a suitable fixture and wherein the connection between the bulb and base prevents relative movement between the parts in operative position, thus practically eliminating the danger of the filament lead wires from becoming short circuited.

It further consists of other novel features of construction, all as will be hereinafter fully set forth.

For the purpose of illustrating my invention, I have shown in the accompanying drawings one form thereof which is at present preferred by me, since the same has been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Figure 1 represents a side elevation showing a tungsten or like type of lamp adapted for use with my novel lamp base. Fig. 2 represents a similar view of an ordinary carbon filament lamp showing my invention applied thereto. Fig. 3 represents a side elevation of the retaining collar. Fig. 4 represents a perspective of the same. Fig. 5 represents a portion of a lamp bulb showing one element of the locking device. Fig. 6 represents a section of the lamp filament support. Fig. 7 represents a side elevation of one part of the lamp base. Fig. 8 represents a section on line yy of Fig. 2.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings. 1 designates an incandescent lamp bulb having, in the 6 snapping over the bead 2 of the bulb 1 and in order to provide for this securing action the collar 7 is preferably split as shown at 8 and carries an overlapping lip 9 to close the joint between the two ends.

10 designates lugs formed in the present instance at suitable points on the sides of the collar 7 and which are adapted in assembled condition-of the base member to be bent outwardly and engage openings 11 correspondingly located in the base cap 12. This base cap 12 is preferably provided with a threaded surface 13 and terminates in a plate 14 of porcelain or like insulating material centrally disposed of which is the contact plug 15. One of the filament terminals, as 16, is electrically connected to the plug 15 while the other Wire 17 as customary connects to the cap 12 whereby a circuit is closed when the parts are properly connected to a socket.

In assembling the device the collar 7 is slipped over the end of the lamp with the portion 6 gripping the bead 2 and the tongue 5 located within the groove 4, this latter preventing turning movement of the collar on the lamp body. It will be apparent by this construction that it is impossible for the positions of the parts to vary with respect to each other thereby obviating twistin or crossing of the terminals of the lamp lament to cause short circuiting. The cap 12 is next slipped over the collar 7 with the openings 11 alined with the lugs 10 which latter are then bent outwardly through the openings to lock the parts together. By the construction just described it is possible to remove at any desired time the lamp base and leave the bulb in such condition that it may be readily opened to remove the filament post for the purpose of inserting a new filament. This is done by cutting the lamp bulb adjacent the bead 2 and on the opposite side thereof from. the lamp body, indicated by line z2 Fig. 1, whereupon the post may be taken out and a new filament connected in place. After this operation takes place the two parts are again united by heating and the lam is ready to have the air exhausted there rom as in the original manufacture thereof. In order to carryout this latter step the sealing point of the lamp 18 can be opened and after the proper vacuum is obtained it may be closed again and the lamp is ready for use.

It will now be apparent that I have de vised a complete unitary structure well adapted for the purpose intended, simple and economical in construction and whereby lamps in which the filament is broken or burned out may readily be replaced and the same bulb and its adjuncts used again. The importance of this construction will readily be understood by those skilled in the art, since such parts as the filament posts of tungsten lamps and others are expensive and the saving due to using them in connection with new filaments and with the same bulb is considerable.

It will now be apparent that I have devised a novel and useful construction of an electric lamp which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have, in the present inaemo instance, shown and described a preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

In an incandescent lamp, a bulb 1 having a circumferential bead 2 formed thereon having a transverse groove 4 out therein, a

collar 7 adapted to encircle a portion of said bulb, a beaded edge 6 formed on said collar for engagement with said bulb bead, a tongue 5 formed on said beaded edge to seat in said groove 4 to prevent relative turning movement between said collar 7 and said bulb 1, and means detachably secured to said collar for attaching said bulb to a suitable socket.

FRANK L. FOWLER.

Witnesses E. HAYWARD FAIRBANKS, G. D. MGVAY. 

